Method and base station for transmitting data over a radio interface in a radio communications system

Abstract

The invention relates to a method and a base station for transmitting data in a downlink direction over a radio interface in a mobile radio communications system. The base station transmits the data in the downlink direction to a radio station in radio blocks that are organized in a time division multiplex method. Recurring training sequences are inserted between the radio blocks without decreasing the transmission power used for transmitting the data. The radio station carries out a channel estimation by means of the training sequences.

I claim:  
     
       1. A method of transmitting data over a radio interface in a mobile radio system, which comprises: 
       transmitting data of at least one communications link in a downlink direction from a base station to at least one radio station in radio blocks of a time division multiplex method organized in time frames;  
       periodically transmitting, within a time frame, training sequences and after a respective training sequence transmitting the radio block of at least one of the communications links, whereby the training sequences are transmitted with a constant transmission power higher than an average transmission power for the radio blocks.  
     
     
       2. The method according to  claim 1 , which comprises selectively interpolating and extrapolating a channel estimation from at least two training sequences with the radio station. 
     
     
       3. The method according to  claim 1 , which comprises combining in a radio block the data of a first communications link to the radio station and from other communications links to other radio stations. 
     
     
       4. The method according to  claim 3 , which comprises varying an amount of data of the respective first communications link and of the other communications links within a radio block in dependence on a required transmission capacity. 
     
     
       5. The method according to  claim 3 , which comprises, in transmission pauses during the first communications link, dynamically utilizing an unused transmission capacity in a radio block by one or more other communications links for transmitting data. 
     
     
       6. The method according to  claim 1 , which comprises shortening a length of the training sequences in each case in comparison with a training sequence configured for a customary multiple propagation, and additionally utilizing a transmission capacity freed up by shortening the training sequences for one of transmitting the data and for error protection. 
     
     
       7. The method according to  claim 1 , which comprises transmitting the training sequences simultaneously on all frequency channels of the radio interface. 
     
     
       8. The method according to  claim 1 , which comprises providing each different data sections of the data of the first communications link with at least one code. 
     
     
       9. In a mobile radio communications system with a base station for transmitting data over a radio interface in the mobile radio communications system, wherein the data of at least one communications link are transmitted in a downlink direction to at least one radio station in radio blocks of a time division multiplex method organized in time frames, an improved base station comprising: 
       a device programmed to periodically insert training sequences into a respective time frame, the training sequences being transmitted with a constant transmission power which is higher than an average transmission power for the radio blocks; and  
       a transmitter device for transmitting the radio block of at least one of the communications links following a respective training sequence.